Microwave low-noise amplifier

Abstract

The invention provides a microwave low-noise amplifier, and relates to the technical field of amplifiers. The microwave low-noise amplifier comprises an amplifier body, wherein the amplifier body is provided with a shell and a circuit board arranged in the shell; the cold and heat conduction mechanism comprises a cooling fin and a circuitous pipe, the cooling fin is arranged between the inner bottom surface of the shell and the lower surface of the circuit board, and the circuitous pipe is connected to the cooling fin; and the semiconductor chilling plate is arranged in the shell, the hot end of the semiconductor chilling plate is used for feeding hot air into the circuitous pipe, and the cold end of the semiconductor chilling plate is used for feeding cold air into the circuitous pipe. According to the low-temperature amplifier, hot air is fed into the concentric-square-shaped pipe through the semiconductor chilling plate, so that heating of the cooling fins is achieved, when the amplifier body is used in a low-temperature environment, heat can be transferred to the circuit board through the cooling fins before the amplifier body works, preheating of the circuit board is achieved, and the stability of the amplifier body during follow-up work is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of amplifiers, and in particular to a microwave low-noise amplifier. Background Art

[0002] Microwave low noise amplifier (LNA) is an indispensable key component in wireless communication, radar system, satellite communication and other fields. Its main function is to amplify weak signals at the front end of the receiving link while minimizing the noise introduced by itself to ensure signal quality.

[0003] With the development of science and technology, more and more electronic devices need to work in extreme environments, such as polar scientific research, space exploration, deep-sea exploration and other fields. In low-temperature environments, the performance of LNA may be seriously affected. Low temperature can cause changes in the electrical properties of semiconductor materials, such as reduced carrier mobility and increased resistivity. These changes may directly affect the gain, noise figure and phase stability of LNA. In addition, low temperature may also increase the mechanical stress of the circuit board, further affecting the reliability and stability of LNA. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a microwave low noise amplifier.

[0005] The present invention provides a microwave low-noise amplifier, comprising: an amplifier body, the amplifier body having a shell and a circuit board arranged in the shell; a heat conduction mechanism, the heat conduction mechanism comprising a heat sink and a circuit-shaped tube, the heat sink is arranged between the inner bottom surface of the shell and the lower surface of the circuit board, and the circuit-shaped tube is connected to the heat sink; a semiconductor refrigeration sheet, the semiconductor refrigeration sheet is arranged in the shell, the hot end of the semiconductor refrigeration sheet is used to send hot air into the circuit-shaped tube, and the cold end of the semiconductor refrigeration sheet is used to send cold air into the circuit-shaped tube.

[0006] Optionally, the microwave low noise amplifier also includes a box body, an air flow channel is formed between the heat sink and the inner wall of the shell, the box body is connected to one side of the inner bottom surface of the shell, the semiconductor refrigeration chip is connected to the box body to separate the two sides of the box body into a first chamber and a second chamber, the hot end and the cold end of the semiconductor refrigeration chip are respectively connected to a hot end fin and a cold end fin, the hot end fin is in the first chamber, and the cold end fin is in the second chamber, the hot end fin is used to deliver hot air to one end of the meandering tube, and the cold end fin is used to deliver cold air to the other end of the meandering tube.

[0007] Optionally, the box body is provided with a first opening, a second opening, a third opening and a fourth opening on both sides respectively, the first opening and the second opening are connected to the second chamber, the third opening and the fourth opening are connected to the first chamber, the first opening is connected to one side of the airflow channel, the second opening is connected to one end of the circuitous tube, the third opening is connected to the other side of the airflow channel, and the fourth opening is connected to the other end of the circuitous tube, and rotatable fan blades are provided in the first opening, the second opening, the third opening and the fourth opening, and the fan blades in the first opening and the second opening have opposite rotation directions to the fan blades in the third opening and the fourth opening.

[0008] Optionally, the microwave low noise also includes a first guide plate and a second guide plate, and the first vent and the second vent are respectively provided on both sides of the shell, the first vent is connected to the first chamber, and the second vent is connected to the second chamber, the first guide plate and the second guide plate are respectively inclined in the second chamber and the first chamber, the first guide plate divides the second chamber into a first air guide cavity on the lower side and a second air guide cavity on the upper side, one end of the first air guide cavity is connected to the second vent, the other end of the first air guide cavity is connected to one end of the second air guide cavity, the other end of the second air guide cavity is connected to the first through-hole and the second through-hole, the second guide plate divides the first chamber into a third air guide cavity on the lower side and a fourth air guide cavity on the upper side, one end of the third air guide cavity is connected to the first vent, the other end of the first vent is connected to the fourth air guide cavity, and the other end of the fourth air guide cavity is connected to the third through-hole and the fourth through-hole.

[0009] Optionally, the microwave low noise further includes a guide plate, and the first guide plate and the second guide plate are respectively connected to the inner top surfaces of the second chamber and the first chamber through the guide plate, and the guide plate is provided with a plurality of perforations.

[0010] Optionally, the driving mechanism is used to drive the fan blades in the first through-hole and the second through-hole to rotate synchronously clockwise, and drive the fan blades in the third through-hole and the fourth through-hole to rotate synchronously counterclockwise, or the driving mechanism is used to drive the fan blades in the first through-hole and the second through-hole to rotate synchronously counterclockwise, and drive the fan blades in the third through-hole and the fourth through-hole to rotate synchronously clockwise.

[0011] Optionally, it also includes a driving mechanism, which includes a driving unit, a first rotating rod, a second rotating rod and a transmission unit, the driving unit is used to drive the first rotating rod and the second rotating rod to rotate synchronously, and the rotation directions of the first rotating rod and the second rotating rod are opposite, the first rotating rod and the fan blades in the first through-hole and the second through-hole are connected by driving the transmission unit, and the second rotating rod and the fan blades in the third through-hole and the fourth through-hole are connected by driving the transmission unit.

[0012] Optionally, the driving unit includes a motor, a driving bevel gear, a first driven bevel gear and a second driven bevel gear, the motor is connected to the box body, the motor is drivingly connected to the driving bevel gear, the two sides of the driving bevel gear are respectively meshed and connected with the first driven bevel gear and the second driven bevel gear, and the first driven bevel gear and the second driven bevel gear are respectively mounted on the first rotating rod and the second rotating rod.

[0013] Optionally, the transmission unit includes a worm, a worm wheel and a rotating rod, the fan blade is mounted on the rotating rod, the worm is mounted on the rotating rod, the worm wheel is meshingly connected to the worm, and the worm is connected to the first rotating rod and the second rotating rod.

[0014] The beneficial effects of the microwave low-noise amplifier of the embodiment of the present invention are as follows: hot air is sent into the meandering tube through the semiconductor refrigeration sheet, thereby achieving heating of the heat sink. Therefore, when the amplifier body is used in a low-temperature environment, heat can be transferred to the circuit board through the heat sink before the amplifier body works, thereby achieving preheating of the circuit board and improving the stability of the amplifier body during subsequent work. When the amplifier body is used in a high-temperature environment, cold air is sent into the meandering tube through the cold end of the semiconductor refrigeration sheet, thereby achieving rapid cooling of the heat sink, thereby accelerating the cooling efficiency of the circuit board and improving the heat dissipation effect of the amplifier body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a microwave low noise amplifier according to an embodiment of the present invention; Figure 2 A top view of the interior of a housing of a microwave low noise amplifier according to an embodiment of the present invention; Figure 3 This is a diagram of the airflow direction when the microwave low noise amplifier according to an embodiment of the present invention is used in a high temperature environment; Figure 4 This is a diagram of the airflow direction when the microwave low noise amplifier according to an embodiment of the present invention is used in a low temperature environment; Figure 5 for Figure 2 A magnified view of the structure at A; Figure 6This is a schematic diagram of the structure of a transmission unit in a microwave low noise amplifier according to an embodiment of the present invention; Figure 7 It is a side view of a microwave low noise amplifier according to an embodiment of the present invention.

[0016] Explanation of the accompanying drawings: 1. amplifier body; 11. shell; 111. first vent; 112. second vent; 113. air flow channel; 12. circuit board; 2. heat transfer mechanism; 21. heat sink; 22. circuit tube; 3. box body; 31. first through-hole; 32. second through-hole; 33. third through-hole; 34. fourth through-hole; 4. guide plate; 41. perforation; 5. semiconductor refrigeration plate; 51. hot end fin; 52. cold end fin; 6. first guide plate; 7. second guide plate; 8. driving mechanism; 81. driving unit; 82. first rotating rod; 83. second rotating rod; 84. transmission unit. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] In the description of this specification, the description with reference to the terms "embodiment", "one embodiment", "some embodiments", "exemplarily" and "one embodiment" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or embodiment are included in at least one embodiment or embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or embodiment. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or embodiments in a suitable manner.

[0020] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0021] The Z axis in the accompanying drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z axis represents the up, and the negative direction of the Z axis represents the down; the X axis in the accompanying drawings represents the horizontal direction, and is designated as the left and right position, and the positive direction of the X axis represents the right side, and the negative direction of the X axis represents the left side; the Y axis in the accompanying drawings represents the front and back position, and the positive direction of the Y axis represents the front side, and the negative direction of the Y axis represents the back side. It should also be noted that the aforementioned Z axis, Y axis, and X axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0022] The embodiment of the present invention provides a microwave low-noise amplifier, comprising: an amplifier body 1, the amplifier body 1 having a shell 11 and a circuit board 12 arranged in the shell 11; a heat conduction mechanism 2, the heat conduction mechanism 2 comprising a heat sink 21 and a winding tube 22, the heat sink 21 is arranged between the inner bottom surface of the shell 11 and the lower surface of the circuit board 12, and the winding tube 22 is connected to the heat sink 21; a semiconductor refrigeration sheet 5, the semiconductor refrigeration sheet 5 is arranged in the shell 11, the hot end of the semiconductor refrigeration sheet 5 is used to supply hot air into the winding tube 22, and the cold end of the semiconductor refrigeration sheet 5 is used to supply cold air into the winding tube 22.

[0023] Specifically, combined Figure 1 and Figure 2 As shown, the length direction of the shell 11 is along the X-axis direction in the figure, the width direction of the shell 11 is along the Y-axis direction in the figure, and the height direction of the shell 11 is along the Z-axis direction in the figure. The amplifier body 1 is a microwave low-noise amplifier. The microwave low-noise amplifier (LNA) is a low-noise amplifier specially designed for the microwave frequency band. While amplifying weak signals, it can reduce the noise of the amplifier itself as much as possible, thereby improving the sensitivity and receiving range of the system. The circuit board 12 has low-noise transistors (such as gallium arsenide field-effect transistors), resistors, capacitors, etc. The above devices together constitute the core circuit of the microwave low-noise amplifier through precise layout and wiring, as well as reasonable impedance matching and grounding design.

[0024] In this optional embodiment, combined with Figure 1 and Figure 2 As shown, hot air is sent into the meandering tube 22 through the semiconductor refrigeration sheet 5, so as to achieve heating of the heat sink 21. Therefore, when the amplifier body 1 is used in a low-temperature environment, heat can be transferred to the circuit board 12 through the heat sink 21 before the amplifier body 1 works, so as to achieve preheating of the circuit board 12 and improve the stability of the amplifier body 1 during subsequent work. When the amplifier body 1 is used in a high-temperature environment, cold air is sent into the meandering tube 22 through the cold end of the semiconductor refrigeration sheet 5, so as to achieve rapid cooling of the heat sink 21, thereby accelerating the cooling efficiency of the circuit board 12 and improving the heat dissipation effect of the amplifier body 1.

[0025] Furthermore, the microwave low noise amplifier also includes a box body 3, an air flow channel 113 is formed between the heat sink 21 and the inner wall of the shell 11, the box body 3 is connected to one side of the inner bottom surface of the shell 11, and the semiconductor refrigeration plate 5 is connected to the box body 3 to separate the two sides of the box body 3 into a first chamber and a second chamber. The hot end and the cold end of the semiconductor refrigeration plate 5 are respectively connected to the hot end fin 51 and the cold end fin 52, the hot end fin 51 is in the first chamber, and the cold end fin 52 is in the second chamber. The hot end fin 51 is used to deliver hot air to one end of the meandering tube 22, and the cold end fin 52 is used to deliver cold air to the other end of the meandering tube 22.

[0026] In this optional embodiment, combined with Figure 2 and Figure 5 As shown, the hot end fin 51 and the cold end fin 52 can be connected to the hot end and the cold end of the semiconductor refrigeration chip 5 through thermal grease. The length of the box body 3 is set along the width direction of the shell 11, and the width of the box body 3 is small, occupying only a small space inside the shell 11. Hot air is sent to one end of the meandering tube 22 through the hot end fin 51. In a low temperature environment, the circuit board 12 can be preheated to a certain extent to ensure that the microwave low noise amplifier can work quickly and stably. Cold air is sent to the other end of the meandering tube 22 through the cold end fin 52 to achieve rapid cooling of the circuit board 12.

[0027] Optionally, a first opening 31, a second opening 32, a third opening 33 and a fourth opening 34 are respectively provided on both sides of the box body 3, the first opening 31 and the second opening 32 are connected to the second chamber, the third opening 33 and the fourth opening 34 are connected to the first chamber, the first opening 31 is connected to one side of the airflow channel 113, the second opening 32 is connected to one end of the detour tube 22, the third opening 33 is connected to the other side of the airflow channel 113, and the fourth opening 34 is connected to the other end of the detour tube 22, and rotatable fan blades are provided in the first opening 31, the second opening 32, the third opening 33 and the fourth opening 34, and the fan blades in the first opening 31 and the second opening 32 rotate in opposite directions to the fan blades in the third opening 33 and the fourth opening 34.

[0028] Furthermore, the microwave low-noise amplifier also includes a first guide plate 6 and a second guide plate 7. The two sides of the shell 11 are also respectively provided with a first vent 111 and a second vent 112. The first vent 111 is connected to the first chamber, and the second vent 112 is connected to the second chamber. The first guide plate 6 and the second guide plate 7 are respectively inclined in the second chamber and the first chamber. The first guide plate 6 divides the second chamber into a first air guide cavity on the lower side and a second air guide cavity on the upper side. One end of the first air guide cavity is connected to the second vent 112, and the other end of the first air guide cavity is connected to one end of the second air guide cavity. The other end of the second air guide cavity is connected to the first through-hole 31 and the second through-hole 32. The second guide plate 7 divides the first chamber into a third air guide cavity on the lower side and a fourth air guide cavity on the upper side. One end of the third air guide cavity is connected to the first vent 111, and the other end of the first vent 111 is connected to the fourth air guide cavity. The other end of the fourth air guide cavity is connected to the third through-hole 33 and the fourth through-hole 34.

[0029] In summary, combined Figure 3 As shown, the direction of the arrow in the figure represents the direction of airflow. When the microwave low-noise amplifier works in a high-temperature environment, the semiconductor refrigeration plate 5 is turned on to make the fan blades in the first through hole 31 and the second through hole 32 suck air, so that the air enters the first air guide cavity from the second ventilation hole 112, and then enters the second air guide cavity from the first air guide cavity, and takes away the cold air on the cold end fin 52, and enters the air flow channel 113 and the detour tube 22 through the first through hole 31 and the second through hole 32, so that the temperature on the heat sink 21 is quickly reduced, thereby improving the heat conduction efficiency of the circuit board 12 to the heat sink 21, and then improving the heat dissipation effect of the circuit board 12. At this time, the fan blades in the third through hole 33 and the fourth through hole 34 blow air, blow the hot air flow from the air flow channel 113 and the detour tube 22 into the fourth air guide cavity, and then enter the third air guide cavity from the fourth air guide cavity, and take away the heat on the hot end fin 51, and discharge it from the first ventilation hole 111, thereby improving the cooling efficiency of the circuit board 12.

[0030] When the microwave low noise amplifier is used in a low temperature environment, the semiconductor refrigeration sheet 5 is also turned on to make the fan blades in the first through hole 31 and the second through hole 32 absorb air, and the air enters the third air guide cavity from the first ventilation hole 111, and then enters the fourth air guide cavity from the third air guide cavity, and takes away the heat on the hot end fin 51, and enters the air flow channel 113 and the detour tube 22 from the third through hole 33 and the fourth through hole 34, so as to achieve the heating effect of the heat sink 21, thereby preheating the circuit board 12 to a certain extent before operation, ensuring that the microwave low noise amplifier can work quickly and stably. At this time, the fan blades in the first through hole 31 and the second through hole 32 are exhausted, and the hot air flow is blown into the second air guide cavity, and then enters the first air guide cavity from the second air guide cavity, takes away the cold air on the cold end fin 52 and discharges it from the second ventilation hole 112. After preheating to a certain temperature, the circuit board 12 works normally. Since the ambient temperature is relatively low, there is no need to turn on the semiconductor refrigeration sheet 5, and it is sufficient to turn on each fan blade for normal air cooling and heat dissipation.

[0031] During normal heat dissipation, the semiconductor refrigeration plate 5 does not work, no matter the fan blades in the first opening 31 and the second opening 32 rotate counterclockwise, and the fan blades in the third opening 33 and the fourth opening 34 rotate clockwise, or the fan blades in the first opening 31 and the second opening 32 rotate clockwise, and the fan blades in the third opening 33 and the fourth opening 34 rotate counterclockwise, both rotation modes are acceptable, and the heat sink 21 absorbs the heat generated by the circuit board 12 through convection through the first vent 111 and the second vent 112, and then discharges the heat on the heat sink 21 through convection, thereby realizing air-cooled heat dissipation.

[0032] Optionally, the microwave low noise amplifier further includes a guide plate 4 , and the first guide plate 6 and the second guide plate 7 are respectively connected to the inner top surfaces of the second chamber and the first chamber through the guide plate 4 , and a plurality of through holes 41 are provided on the guide plate 4 .

[0033] In this optional embodiment, the guide plate 4 can play the role of installing the first guide plate 6 and the second guide plate 7, and because the guide plate 4 in the second air guide cavity is close to the cold end fin 52, due to the blocking effect of the guide plate 4, part of the airflow can be introduced into the upper end of the cold end fin 52, and then enter the second air guide cavity from the perforation 41, thereby improving the efficiency of taking away the cold air on the cold end fin 52. The guide plate 4 near the hot end fin 51 has the same principle as above, and will not be elaborated here.

[0034] Optionally, the microwave low-noise amplifier also includes a driving mechanism 8 for driving the blades in the first through-hole 31 and the second through-hole 32 to rotate synchronously clockwise, and driving the blades in the third through-hole 33 and the fourth through-hole 34 to rotate synchronously counterclockwise, or the driving mechanism 8 is used to drive the blades in the first through-hole 31 and the second through-hole 32 to rotate synchronously counterclockwise, and drive the blades in the third through-hole 33 and the fourth through-hole 34 to rotate synchronously clockwise.

[0035] Furthermore, the driving mechanism 8 includes a driving unit 81, a first rotating rod 82, a second rotating rod 83 and a transmission unit 84. The driving unit 81 is used to drive the first rotating rod 82 and the second rotating rod 83 to rotate synchronously, and the rotation directions of the first rotating rod 82 and the second rotating rod 83 are opposite. The first rotating rod 82 and the fan blades in the first through-hole 31 and the second through-hole 32 are driven and connected by the transmission unit 84, and the second rotating rod 83 and the fan blades in the third through-hole 33 and the fourth through-hole 34 are driven and connected by the transmission unit 84.

[0036] Optionally, the driving unit 81 includes a motor, a driving bevel gear, a first driven bevel gear and a second driven bevel gear. The motor is connected to the box body 3, and the motor is drivingly connected to the driving bevel gear. The two sides of the driving bevel gear are respectively meshed with the first driven bevel gear and the second driven bevel gear. The first driven bevel gear and the second driven bevel gear are respectively mounted on the first rotating rod 82 and the second rotating rod 83.

[0037] In this optional embodiment, combined with Figure 3 and Figure 5 As shown, the motor can be installed on the upper surface of the box body 3, and the driving bevel gear is mounted on the output shaft of the motor. The output shaft of the motor drives the driving bevel gear to rotate, and the driving bevel gear drives the first driven bevel gear and the second driven bevel gear to rotate synchronously, and the rotation directions of the first driven bevel gear and the second driven bevel gear are opposite, thereby driving the first rotating rod 82 and the second rotating rod 83 to rotate in opposite directions.

[0038] Furthermore, the transmission unit 84 includes a worm, a worm wheel and a rotating rod, the fan blade is mounted on the rotating rod, the worm is mounted on the rotating rod, the worm wheel is meshedly connected to the worm, and the worm is connected to the first rotating rod 82 or the second rotating rod 83.

[0039] In this optional embodiment, combined with Figure 6 As shown, the rotating rod can be rotatably connected to the mounting frame via a bearing, and the mounting frame can be installed at corresponding positions of the shell 11 and the box body 3. Taking the second rotating rod 83 as an example, the worm is connected to the second rotating rod 83. When the second rotating rod 83 rotates, the rotation of the worm drives the worm wheel to rotate, thereby driving the fan blades to rotate through the rotating rod.

[0040] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A microwave low noise amplifier, characterized in that: include: An amplifier body (1), the amplifier body (1) comprising a housing (11) and a circuit board (12) arranged in the housing (11); A heat transfer mechanism (2), the heat transfer mechanism (2) comprising a heat sink (21) and a meandering tube (22), the heat sink (21) being arranged between the inner bottom surface of the housing (11) and the lower surface of the circuit board (12), and the meandering tube (22) being connected to the heat sink (21); A semiconductor refrigeration sheet (5), wherein the semiconductor refrigeration sheet (5) is arranged in the shell (11), the hot end of the semiconductor refrigeration sheet (5) is used to send hot air into the meandering tube (22), and the cold end of the semiconductor refrigeration sheet (5) is used to send cold air into the meandering tube (22).

2. The microwave low noise amplifier according to claim 1, characterized in that: The invention also comprises a box body (3), an air flow channel (113) being formed between the heat sink (21) and the inner peripheral wall of the shell (11), the box body (3) being connected to one side of the inner bottom surface of the shell (11), the semiconductor cooling fin (5) being connected inside the box body (3) so as to separate the two sides of the box body (3) into a first chamber and a second chamber, the hot end and the cold end of the semiconductor cooling fin (5) being respectively connected to a hot end fin (51) and a cold end fin (52), the hot end fin (51) being located in the first chamber, and the cold end fin (52) being located in the second chamber, the hot end fin (51) being used to deliver hot air to one end of the meandering tube (22), and the cold end fin (52) being used to deliver cold air to the other end of the meandering tube (22).

3. The microwave low noise amplifier according to claim 2, characterized in that: A first through hole (31), a second through hole (32), a third through hole (33), and a fourth through hole (34) are respectively provided on both sides of the box body (3); the first through hole (31) and the second through hole (32) are in communication with the second chamber, and the third through hole (33) and the fourth through hole (34) are in communication with the first chamber; the first through hole (31) is in communication with one side of the air flow channel (113), the second through hole (32) is in communication with one end of the meandering tube (22), the third through hole (33) is in communication with the other side of the air flow channel (113), and the fourth through hole (34) is in communication with the other end of the meandering tube (22); rotatable fan blades are provided in the first through hole (31), the second through hole (32), the third through hole (33), and the fourth through hole (34); the fan blades in the first through hole (31) and the second through hole (32) rotate in opposite directions to the fan blades in the third through hole (33) and the fourth through hole (34).

4. The microwave low noise amplifier according to claim 3, characterized in that: The housing (11) further comprises a first guide plate (6) and a second guide plate (7); a first vent (111) and a second vent (112) are respectively provided on both sides of the housing (11); the first vent (111) is communicated with the first chamber; the second vent (112) is communicated with the second chamber; the first guide plate (6) and the second guide plate (7) are respectively arranged obliquely in the second chamber and the first chamber; the first guide plate (6) divides the second chamber into a first air guide cavity at a lower side and a second air guide cavity at an upper side; one end of the first air guide cavity is connected to the second chamber; The first air guide cavity is connected to the vent (112), the other end of the first air guide cavity is connected to one end of the second air guide cavity, the other end of the second air guide cavity is connected to the first through hole (31) and the second through hole (32), the second guide plate (7) divides the first chamber into a third air guide cavity at the bottom and a fourth air guide cavity at the top, one end of the third air guide cavity is connected to the first vent (111), the other end of the first vent (111) is connected to the fourth air guide cavity, and the other end of the fourth air guide cavity is connected to the third through hole (33) and the fourth through hole (34).

5. The microwave low noise amplifier according to claim 4, characterized in that: It also comprises a guide plate (4), wherein the first guide plate (6) and the second guide plate (7) are respectively connected to the inner top surfaces of the second chamber and the first chamber through the guide plate (4), and the guide plate (4) is provided with a plurality of perforations (41).

6. The microwave low noise amplifier according to claim 3, characterized in that: The invention also comprises a driving mechanism (8), wherein the driving mechanism (8) is used to drive the fan blades in the first through-hole (31) and the second through-hole (32) to rotate synchronously clockwise, and to drive the fan blades in the third through-hole (33) and the fourth through-hole (34) to rotate synchronously counterclockwise, or the driving mechanism (8) is used to drive the fan blades in the first through-hole (31) and the second through-hole (32) to rotate synchronously counterclockwise, and to drive the fan blades in the third through-hole (33) and the fourth through-hole (34) to rotate synchronously clockwise.

7. The microwave low noise amplifier according to claim 6, characterized in that: The driving mechanism (8) comprises a driving unit (81), a first rotating rod (82), a second rotating rod (83) and a transmission unit (84); the driving unit (81) is used to drive the first rotating rod (82) and the second rotating rod (83) to rotate synchronously, and the rotation directions of the first rotating rod (82) and the second rotating rod (83) are opposite; the first rotating rod (82) and the fan blades in the first through-hole (31) and the second through-hole (32) are drivingly connected via the transmission unit (84); the second rotating rod (83) and the fan blades in the third through-hole (33) and the fourth through-hole (34) are drivingly connected via the transmission unit (84).

8. The microwave low noise amplifier according to claim 7, characterized in that: The driving unit (81) comprises a motor, a driving bevel gear, a first driven bevel gear and a second driven bevel gear, the motor is connected to the box body (3), the motor is drivingly connected to the driving bevel gear, both sides of the driving bevel gear are respectively meshed with the first driven bevel gear and the second driven bevel gear, and the first driven bevel gear and the second driven bevel gear are respectively mounted on the first rotating rod (82) and the second rotating rod (83).

9. The microwave low noise amplifier according to claim 8, characterized in that: The transmission unit (84) comprises a worm, a worm wheel and a rotating rod, the fan blade is sleeved on the rotating rod, the worm is sleeved on the rotating rod, the worm wheel is meshingly connected with the worm, and the worm is connected to the first rotating rod (82) and the second rotating rod (83).

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